<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>字符串转JSON</title>
    <script type="text/javascript">
        var str = "{\"class_name\":\"五年级四班\"}";//str.ename
        var json = JSON.parse(str);
        console.log(str);
        console.log(json);
        document.write("班级:" + json.class_name);
    </script>
</head>
<body>

</body>
</html>